Need to quote expansion of $cfg.LogFormatStream in log_stream access log

[turchanov]

format in nginx.tmpl otherwise individual variables are just glued together
without separating spaces so that you would get these in access logs:

[10/Oct/2019:05:03:30 +0000]TCP200000.003
[10/Oct/2019:05:03:30 +0000]TCP200000.000
[10/Oct/2019:05:05:04 +0000]TCP200000.000

which supposed to be someting like these:

[10/Oct/2019:05:03:30 +0000] TCP 200 0 0 0.003
[10/Oct/2019:05:03:30 +0000] TCP 200 0 0 0.000
[10/Oct/2019:05:05:04 +0000] TCP 200 0 0 0.000

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[turchanov]

Signed the agreement.

[aledbf]

/ok-to-test

[aledbf]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, turchanov

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[codecov-io]

Codecov Report

Merging #4658 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4658      +/-   ##
==========================================
+ Coverage   58.67%   58.72%   +0.04%     
==========================================
  Files          88       88              
  Lines        6764     6766       +2     
==========================================
+ Hits         3969     3973       +4     
+ Misses       2356     2355       -1     
+ Partials      439      438       -1

Impacted Files	Coverage Δ
...nternal/ingress/controller/template/buffer_pool.go	100% <0%> (ø)	⬆️
internal/ingress/metric/collectors/process.go	90.42% <0%> (+2.12%)	⬆️

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[aledbf]

/retest